To install the BotBlock plugin:

Edit the BotBlock.pm file to set the variables at the top.  These are:
  * directory for temp files---probably somewhere in your home directory
  * maximum number of outstanding requests (default 200)
  * minimum time that requests will be held open (default about an hour)
  * log file (set to the empty string to turn off logging)

Edit BotBlockQuestions.pm and change up the questions a bit.  Don't make
them too hard!  You want them to be something that any human being could
answer easily.  Instructions can be found in doc/questions.html .

Copy all three module files (BotBlock.pm, BotBlockAlg.pm, and
BotBlockQuestions.pm) into the lib/MT directory.

Copy botblock.pl into the plugins directory.

(The other .pl files can be deleted if you like; they're there in case
you want to play with the modules from the command line.)

In lib/MT/App/Comments.pm, add in the following lines (around line 165,
immediately after the check for an empty text field that generates the
error "Comment text is required"):

    ### BotBlock checker
    require MT::BotBlock;
    if (!MT::BotBlock::verify($q->param('bb-index'),
                              $q->param('bb-response'))) { 
      return $app->handle_error($app->translate("Incorrect response to
              the bot-blocker question."));
    } 
    ### end BotBlock checker

Then, anyplace a user can submit a comment (typically in the comment list,
comment error, comment preview, and single entry pages), add in the tag
<$MTBotBlock$>.  That should be all you need to do!
